<template>
  <div id="app">
    <div class="todo-container">
      <div class="todo-wrap">
        <Header :addTodos="addTodos"/>
        <List :todos="todos" :changeFinshStatus="changeFinshStatus" :delTodoItem="delTodoItem"/>
        <Footer 
        v-if="todos.length>0"
        :todos="todos"
        :finishAllTodoObj="finishAllTodoObj"
        :clearFinishedObj="clearFinishedObj"
        />
      </div>
    </div>
  </div>
</template>

<script>
import Header from './components/Header.vue';
import List from "./components/List.vue";
import Footer from "./components/Footer.vue";

export default {
  name: 'App',
  components: {
    Header,
    List,
    Footer
  },
  data() {
    return {
      todos:[]
    };
  },

  methods:{
    init(){
      //获取列表
      //  localStorage.setItem("todos",JSON.stringify(obj))
      this.todos = JSON.parse(localStorage.getItem("todos")) ||[]
    },

    //添加todo项
    addTodos(todoObj){
        this.todos.unshift(todoObj)
    },

    //改变完成状态
    changeFinshStatus(id){
       this.todos.forEach(item=>{
        if (item.id==id) {
          item.finished = !item.finished;
          console.log(item);
        }
       })
    },

    //删除项目
    delTodoItem(id){
      this.todos= this.todos.filter(item=>{
        return id!=item.id
      })
    },

    //改变todoobj的状态
    finishAllTodoObj(){
      this.todos.forEach(e=>{
        e.finished = !e.finished;
      })
    },

    //清除所有完成的项目
    clearFinishedObj(){
      this.todos= this.todos.filter(e=> !e.finished)
    }
  },

  watch:{
    //写入本地存储
    todos:{
      deep:true,
      handler(newVal){
        localStorage.setItem("todos",JSON.stringify(this.todos))
      }
    }
  },
created(){
    this.init()
}

  
}
</script>

<style>
  body {
    background: #fff;
  }

  .btn {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 0;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
  }

  .btn-danger {
    color: #fff;
    background-color: #da4f49;
    border: 1px solid #bd362f;
  }

  .btn-danger:hover {
    color: #fff;
    background-color: #bd362f;
  }

  .btn:focus {
    outline: none;
  }

  .todo-container {
    width: 600px;
    margin: 0 auto;
  }
  .todo-container .todo-wrap {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
  }
</style>